ISTBvsNUBDETF Comparison
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iShares Core 1-5 Year USD Bond ETF (ISTB) and Nushares ESG U.S. Aggregate Bond ETF (NUBD) belong to the same industry segment: US Aggregate Bonds. ISTB's top 3 sector exposures are Sovereign, Finance and Industrials. In contrast, NUBD's top sector exposures are Sovereign, Industrials and Finance. ISTB is less expensive with a Total Expense Ratio (TER) of 0.06%, versus 0.15% for NUBD. ISTB is up 0.42% year-to-date (YTD) with +$515M in YTD flows. NUBD performs worse with -1.32% YTD performance, and +$42M in YTD flows. Run a side-by-side ETF comparison of ISTB and NUBD below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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ISTB vs NUBD performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/10/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | ISTB NUBD | -0.44%-0.89% | +0.03%-1.25% | +0.42%-1.32% | +1.58%-0.60% | +15.32%+12.05% | +9.41%-3.08% |
| Flows | ISTB NUBD | +$9M+$28M | +$235M+$43M | +$515M+$42M | +$774M+$84M | +$888M+$219M | -$448M+$278M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | ISTB NUBD | +1.89%+4.02% | +1.69%+3.63% | +2.16%+5.02% | +2.66%+5.85% |
| Max drawdown | ISTB NUBD | -0.80%-2.35% | -1.28%-3.12% | -1.30%-4.84% | -9.24%-17.80% |
| Max drawdown duration | ISTB NUBD | 16d73d | 156d193d | 133d318d | 1030d1822d |
Trading data
ISTB | NUBD | |
Last sale 9/11/2026 at 1:30 PM | $47.52 | $21.47 |
| Previous close 09/10/2026 | $47.55 | $21.48 |
| Consolidated volume 09/10/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of August 31, 2026
1-year trailing difference
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ISTB | NUBD | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/11/2026 at 1:30 PM
Live
Closed
ISTB | NUBD | |
|---|---|---|
| Last price | $47.52 | $21.47 |
| 1D performance | -0.06% | -0.05% |
| AuM | $5.10 B | $485.25 M |
| E/R | 0.06% | 0.15% |
Characteristics
ISTB | NUBD | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | iShares | Nuveen |
| Benchmark | Bloomberg U.S. Universal 1-5 Year Index | Bloomberg MSCI US Agg ESG Select Index |
| N° of holdings | 7074 | 2126 |
| Asset class | Bonds | Fixed Income |
| Trailing 12m distribution yield | Join | Join |
| Inception date | October 18, 2012 | September 29, 2017 |
| ESG | No | Yes |
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Exposure
Countries
ISTB
USA
78.76%
Other
21.24%
NUBD
USA
78.64%
Other
21.36%
Sectors
ISTB
Sovereign
54.84%
Finance
19.07%
Other
26.09%
NUBD
Sovereign
46.37%
Industrials
12.61%
Finance
11.06%
Other
29.96%
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Diversification
ISTB
Total weight of top 15 holdings out of 15
12.12%
NUBD
Total weight of top 15 holdings out of 15
14.13%
Top 15 holdings
Data as of July 31, 2026
ISTB
USA, Notes 3.875% 15jun2028, USD (AP-2028)
1.08%
BlackRock Cash Funds - Institutional
1.03%
USA, Notes 4% 28feb2030, USD (H-2030)
0.92%
USA, Notes 3.625% 31oct2030, USD (AF-2030)
0.89%
USA, Notes 3.5% 30nov2030, USD (AG-2030)
0.84%
USA, Notes 3.75% 31jan2031, USD (U-2031)
0.83%
USA, Notes 3.625% 30sep2030, USD (AD-2030)
0.80%
USA, Notes 3.625% 31aug2030, USD (AC-2030)
0.80%
USA, Notes 4% 31may2030, USD (Z-2030)
0.76%
USA, Notes 4% 31jul2029, USD (AB-2029)
0.75%
USA, Notes 4.125% 31oct2029, USD (AF-2029)
0.75%
USA, Notes 3.875% 15jul2028, USD (AQ-2028)
0.74%
USA, Notes 4.5% 31may2029, USD (Z-2029)
0.65%
USA, Notes 4.25% 30jun2029, USD (AA-2029)
0.65%
USA, Notes 4.25% 31jan2030, USD (U-2030)
0.64%
NUBD
USA, Notes 3.625% 30sep2030, USD (AD-2030)
1.67%
USA, Notes 4.125% 31oct2029, USD (AF-2029)
1.09%
US31418D7F32
1.08%
USA, Notes 3.75% 31dec2028, USD (AH-2028)
1.02%
USA, Notes 3.875% 31jul2030, USD (AB-2030)
1.00%
USA, Notes 3.625% 31oct2030, USD (AF-2030)
0.99%
USA, Notes 3.625% 31aug2029, USD (AC-2029)
0.98%
USA, Notes 4.25% 28feb2029, USD (V-2029)
0.84%
USA, Notes 3.625% 31dec2030, USD (AH-2030)
0.81%
USA, Notes 4.625% 30sep2028, USD (AD-2028)
0.81%
USA, Notes 3.875% 30apr2031, USD (Y-2031)
0.80%
USA, Notes 4.25% 30jun2029, USD (AA-2029)
0.79%
USA, Notes 3.5% 30sep2029, USD (AD-2029)
0.76%
USA, Notes 3.875% 30apr2030, USD (Y-2030)
0.74%
USA, Notes 3.5% 30nov2030, USD (AG-2030)
0.74%
Frequently asked questions about ISTB and NUBD
How have the ISTB and NUBD ETFs performed in 2026?
As of September 10, 2026, ISTB is up 0.42% year-to-date (YTD), while NUBD has lost -1.32%. That puts ISTB better performer ahead so far this year.
Which ETF is attracting more investor money: ISTB or NUBD?
Year-to-date, the ISTB ETF saw +$515M in flows, compared to +$42M for NUBD.
Which ETF is more volatile: ISTB or NUBD?
Over the past year, ISTB had a volatility of 1.69%, while NUBD experienced 3.63%.
Which ETF is bigger: ISTB or NUBD?
As of September 10, 2026, ISTB holds $5.10 B in assets under management (AUM), while NUBD manages $485.25 M.
What sectors do the ISTB and NUBD ETFs invest in?
ISTB leans toward sectors like Sovereign and Finance. Meanwhile, NUBD focuses on Sovereign, Industrials and Finance.
What are the top holdings of the ISTB ETF and NUBD ETF?
ISTB top holdings include USA, Notes 3.875% 15jun2028, USD (AP-2028), BlackRock Cash Funds - Institutional and USA, Notes 4% 28feb2030, USD (H-2030). NUBD holds in its top three: USA, Notes 3.625% 30sep2030, USD (AD-2030), USA, Notes 4.125% 31oct2029, USD (AF-2029) and US31418D7F32.
Which ETF is more diversified: ISTB or NUBD?
ISTB holds 7395 securities with 12.12% of its assets in the top 15. NUBD has 2383 securities and a top 15 weight of 14.13%.
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